A box is made out of a 20-inch x 20-inch piece of cardboard by folding and cutting as shown on the picture as shown in the picture. Find the dimensions of a box with the largest volume.

Step-by-step explanation:

so now we are going to find the area of larger figure and subctract the rectangle from the figure

Area of triangle = 1/2 bh

= 1/2 (12) (12)

= 72 m2

Area of rectangle = L× W

= 3 × 9

=27 m2

Area of the figure= (72-27) m2

=45m2

so the figure has area of shaded region 45m2

The spares should be kept to maintain a 90% or more probability of system success is 35

Let λ be the normal number of component disappointments per year, at that point the disappointment rate (or rate parameter) is given by λ/52 since there are 52 weeks in a year. Let's signify this by μ = λ/52.

The framework victory likelihood can be modeled utilizing the Poisson dissemination since the disappointments happen haphazardly and freely over time. Let X be the number of component disappointments in a year, at that point X takes after a Poisson conveyance with cruel λ.

To preserve a 90% or more likelihood of system victory, we got to guarantee that the number of saves is adequate to cover at the slightest 90% of the potential disappointments. This implies that the likelihood of having more than k disappointments in a year ought to be less than or break even with 0.1, where k is the number of saves.

Let Y be the number of component disappointments amid the two-week conveyance time. At that point, Y too takes after a Poisson conveyance with cruel μ/26, since there are 26 weeks in a half-year (i.e., two quarters). The likelihood of having more than k disappointments amid the conveyance time is given by:

P(Y > k) = 1 - P(Y ≤ k) = 1 - ∑_[tex]{i=0}^k (e^(-μ/26) (μ/26)^i[/tex]/ i!)

where e is the base of the common logarithm.

To preserve a 90% or more likelihood of system victory, we ought to select k such that P(Y > k) ≤ 0.1. Able to solve for k numerically, employing a spreadsheet or a computer program.

For example, utilizing Microsoft Exceed expectations or Go-ogle Sheets, ready to utilize the taking after an equation to compute P(Y > k) for distinctive values of k:

=1-POISSON(k,μ/26,TRUE)

where POISSON is the Poisson total conveyance work, with the moment contention being the cruel and the third contention being Genuine to indicate an aggregate conveyance.

Beginning with k = 26 (i.e., one save per week), able to increment k until we discover the littlest esteem that fulfills P(Y > k) ≤ 0.1. In this case, we discover that k = 35 saves are required to preserve a 90% or more likelihood of framework victory. 

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The perimeter of the figure in this problem is given as follows:

P = 36.6.

The perimeter of a polygon is given by the sum of all the lengths of the outer edges of the figure, that is, we must find the length of all the edges of the polygon, and then add these lengths to obtain the perimeter.

For this problem, three of the lengths are quite straightforward, as follows:

10, 4 and 10.

The fourth length is half the circumference of a circle of diameter 4 = radius 2, hence it is given as follows:

C = 2πr

C = 4π.

C = 12.6.

Hence the perimeter of the figure is given as follows:

P = 10 + 4 + 10 + 12.6

P = 36.6.

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For example, if the events were "you earn an A" and "your friend, who always studies with you, earns an A", these events would be dependent because the probability of your friend earning an A would be affected by whether or not you earn an A.

In this case, the events are not mutually exclusive because both events can happen at the same time (i.e., both you and a randomly selected student can earn an A in the course).

The events can be considered independent if one event does not affect the probability of the other event occurring. In this case, whether you earn an A does not affect the probability of the randomly selected student also earning an A. Therefore, the events can be considered independent.

Note that if the events were dependent, it would mean that the probability of one event occurring would affect the probability of the other event occurring. For example, if the events were "you earn an A" and "your friend, who always studies with you, earns an A", these events would be dependent because the probability of your friend earning an A would be affected by whether or not you earn an A.

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The area of the shaded portion of the given shape is: 114 yd²

The formula for the area of a rectangle is expressed as:

A = L * W

Where:

L is Length

W is Width

Now, to find the area of the shaded part, we will find the area of the bigger rectangle and subtract the area of the unshaded rectangle from it.

Thus:

Area of shaded part = (20 * 12) - (14 * 9)

Area of shaded part = 240 - 126

Area of shaded part = 114 yd²

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We are 95% confident that the true population mean weight of beetles in the Smith Island population lies between 0.1876 grams and 0.2324 grams.

To calculate the 95% confidence interval for the population mean, we can use the formula:

CI = X ± z*(σ/√n)

where X is the sample mean, σ is the population standard deviation, n is the sample size, and z* is the critical value of the standard normal distribution corresponding to the desired level of confidence.

In this case, X = 0.21 grams, σ = 0.05 grams, n = 20, and the critical z value for a 95% confidence level is 1.96.

So, the confidence interval can be calculated as:

CI = 0.21 ± 1.96*(0.05/√20)

= 0.21 ± 0.0224

Therefore, the 95% confidence interval for the population mean weight of beetles in the Smith Island population is (0.1876, 0.2324) grams.

The correct confidence interval statement would be: We are 95% confident that the true population mean weight of beetles in the Smith Island population lies between 0.1876 grams and 0.2324 grams.

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Answer:

30 oranges

Step-by-step explanation:

Divide 3,000 by 100 and you get the number of 30 so which means they can put 30 oranges each box if they wanted to.

Step-by-step explanation:

Answer: 30

Step-by-step explanation:

divide 3000 by 100 and then you git your answer

The functions x^2 + 2x and 3x^2 + kx are linearly independent if k is not equal to 0 or 1.

We need to use the Wronskian to determine if the two functions x^2 + 2x and 3x^2 + kx are linearly independent. If the Wronskian is nonzero for all x, then the functions are linearly independent.

The Wronskian of two functions f(x) and g(x) is defined as:

W(f,g)(x) = f(x)g'(x) - g(x)f'(x)

Let's find the Wronskian of x^2 + 2x and 3x^2 + kx:

W(x^2 + 2x, 3x^2 + kx)(x) = (x^2 + 2x)(6x + k) - (3x^2 + kx)(2x + 2)

= 6x^3 + 2kx^2 + 12x^2 + 4kx - 6x^3 - 6kx - 6x^2 - 6x^2

= -2kx^2 + 2kx

We want the Wronskian to be nonzero for all x, which means that -2kx^2 + 2kx cannot be zero for any value of x, except possibly at x = 0. Therefore, we need to find the values of k that make -2kx^2 + 2kx = 0 only at x = 0.

Factoring out 2kx, we get:

-2kx(x - 1) = 0

This expression is equal to zero when x = 0 or x = 1. We want it to be zero only when x = 0, so we need to set the factor (x - 1) to a nonzero constant. This means k cannot be equal to zero or 1.

Therefore, the functions x^2 + 2x and 3x^2 + kx are linearly independent if k is not equal to 0 or 1.

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The statement that is true is that D. Patricia is not correct because both 3 – 4i  and 11+√2i  must be roots.

A polynomial function is a function that involves only non-negative integer powers or only positive integer exponents of a variable in an equation like the quadratic equation, cubic equation, etc.

From the information, Patricia is studying a polynomial function f(x). Three given roots of f(x) are -11-√2i , 3 + 4i, and 10. Patricia concludes that f(x) must be a polynomial with degree 4.

In this case, the correct option is D.

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Patricia is studying a polynomial function f(x). Three given roots of f(x) are -11-√2i , 3 + 4i, and 10. Patricia concludes that f(x) must be a polynomial with degree 4. Which statement is true?

A. Patricia is correct because -11+√2i must be a root.

B. Patricia is correct because 3 – 4i must be a root.

C. Patricia is not correct because both 3 – 4i  and -11+√2i  must be roots.

D. Patricia is not correct because both 3 – 4i  and 11+√2i  must be roots

Answer: D

Step-by-step explanation:

edge 2023

Answer:

The answer is 56.52 .

Step-by-step explanation:

18 multiple 3.14

To know chi-square goodness-of-fit test conducted to determine whether the data provide convincing evidence that the distribution has changed. The test statistic was 10.13 with a p-value of 0.0175.

To ascertain if the observed data adheres to a predetermined distribution, the chi-square goodness-of-fit test is utilised.

The test statistic is determined using the following formula: 2 = [(O - E)2 / E]where 2 is the test statistic, is the sum of all the categories, and O and E are the observed and predicted frequencies.

If the null hypothesis is true, the p-value is the likelihood that a test statistic will be equally extreme or more extreme than the observed one.

The null hypothesis in this situation is that the distribution has not altered.

If the p-value is less than 0.05, we reject the null hypothesis and come to the conclusion that there is a statistically significant difference between the observed and predicted frequencies, indicating that the distribution has really changed. This is because the generally used significance level is 0.05.

The test statistic in this instance is 10.13, and the p-value is 0.0175.

We reject the null hypothesis since the p-value is less than 0.05 and come to the conclusion that the data is strong evidence that the distribution has altered.

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The age of the man , his son, and his grandson is equal to 60 years, 30 years, and  6 years old.

Let x be the age of the son

2x be the age of the man since he is twice as old as his son.

let y be the age of the grandson .

The sum of their ages is 96.

x + 2x + y = 96

Simplifying this equation, we get

⇒3x + y = 96

The man is ten times as old as his grandson,

⇒2x = 10y

Simplifying this equation, we get,

⇒x = 5y

Now substitute x = 5y into the first equation,

⇒3x + y = 96

⇒3(5y) + y = 96

⇒15y + y = 96

⇒16y = 96

⇒y = 6

So the grandson is 6 years old.

Using x = 5y

⇒The son is 30 years old.

Finally, the man is 2x = 2(30)

                                  = 60 years old.

Therefore, the man is 60 years old, his son is 30 years old, and his grandson is 6 years old.

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The correct answer is c. Learning curves are important for estimating performance improvement as workers become experienced.

Learning curves are often used in project management to estimating the time, effort, and resources required to complete a task or project. They help to estimate how long it will take for a worker or team to become proficient at a task or process, based on the amount of time and effort that they have put into it.

This can be helpful in estimating performance improvement as workers become more experienced and efficient in their work. The concept of a learning curve is a curved line that represents the rate of improvement over time, which is why the term "curve" is relevant. While learning curves do involve some math, they are not primarily focused on helping new PMs understand required math, nor are they used for visualization of curved mechanical parts or estimating cost improvement as parts become "broken in."
Learning curves are important for:
c. estimating performance improvement as workers become experienced.
Learning curves represent the progress made in a skill or job over time, whereas a curve illustrates the relationship between experience and efficiency. As workers become more experienced, their performance typically improves, which can be estimated using a learning curve in various industries and tasks.

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We have calculated joint, marginal, conditional probability mass function (pmf).  

What is probability?

Probability is a measure of the likelihood or chance of an event occurring. It is a number between 0 and 1, with 0 representing an impossible event and 1 representing a certain event. The probability of an event is calculated by dividing the number of ways the event can occur by the total number of possible outcomes.

(a) The joint probability mass function (pmf) of the pair (X, Y) can be found by listing all possible outcomes and their probabilities. There are 2³ = 8 possible outcomes, which are:

HHH, HHT, HTH, HTT, THH, THT, TTH, TTT

The values of X and Y for each outcome are:

HHH: X=2, Y=2

HHT: X=2, Y=1

HTH: X=1, Y=1

HTT: X=1, Y=0

THH: X=1, Y=2

THT: X=1, Y=1

TTH: X=0, Y=1

TTT: X=0, Y=0

The probability of each outcome can be calculated as (1/2)³ = 1/8, since each coin toss is independent and has a probability of 1/2 of being heads or tails. Therefore, the joint pmf of (X, Y) is:

P(X=0,Y=0) = 1/8

P(X=0,Y=1) = 1/4

P(X=0,Y=2) = 1/8

P(X=1,Y=1) = 1/4

P(X=1,Y=2) = 1/8

P(X=2,Y=1) = 1/4

P(X=2,Y=2) = 1/8

(b) The marginal pmf of X can be found by summing the joint pmf over all possible values of Y:

P(X=0) = P(X=0,Y=0) + P(X=0,Y=1) + P(X=0,Y=2) = 3/8

P(X=1) = P(X=1,Y=1) + P(X=1,Y=2) + P(X=0,Y=1) = 1/2

P(X=2) = P(X=2,Y=1) + P(X=2,Y=2) = 3/8

Similarly, the marginal pmf of Y can be found by summing the joint pmf over all possible values of X:

P(Y=0) = P(X=0,Y=0) + P(X=1,Y=0) = 1/4

P(Y=1) = P(X=0,Y=1) + P(X=1,Y=1) + P(X=2,Y=1) = 1/2

P(Y=2) = P(X=1,Y=2) + P(X=2,Y=2) = 1/4

(c) The conditional pmf of X given Y = 1 is:

P(X=0|Y=1) = P(X=0,Y=1)/P(Y=1) = (1/4)/(1/2) = 1/2

P(X=1|Y=1) = P(X=1,Y=1)/P(Y=1) = (1/4)/(1/2) = 1/2

P(X=2|Y=1) = P(X=2,Y=1)/P(Y=1) = 0

The conditional pmf of X given Y = 2 is:

P(X=0|Y=2) = P(X=0,Y=2)/P(Y=2) = (1/8)/(1/4) = 1/2

P(X=1|Y=2)

Hence, We can conclude that we have calculated joint, marginal, conditional probability mass function (pmf).  

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Answer:

The solutions to the quadratic equation y = x^2 + 3x + 4 are (-1.5 + 1.936i) and (-1.5 - 1.936i).

Step-by-step explanation:

mark brainliest

A) The correct features is,

⇒ a = 9000

⇒ r = 15%

B) The equation correctly models the context of the problem is,

⇒ y = 9000 (0.85)ˣ

We have to given that;

Tiffany’s mother bought a car for $9000 five years ago.

And, She wants to sell it to Tiffany based on a 15% annual rate of depreciation.

Now, We have;

the exponential growth formula is,

⇒ y = a(1 − r)ˣ

Here, We have;

⇒ a = 9000

⇒ r = 15%

Thus, We get;

The equation correctly models the context of the problem is,

⇒ y = a(1 − r)ˣ

⇒ y = 9000 (1 - 0.15)ˣ

⇒ y = 9000 (0.85)ˣ

Therefore, We get;

A) The correct features is,

⇒ a = 9000

⇒ r = 15%

B) The equation correctly models the context of the problem is,

⇒ y = 9000 (0.85)ˣ

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Complete question is,

Tiffany’s mother bought a car for $9000 five years ago. She wants to sell it to Tiffany based on a 15% annual rate of depreciation.

Part A. Identify each feature of the problem as it relates to the context and the exponential growth formula: y=a(1−r)t

a=

r=

Part B. Which equation correctly models the context of the problem?

Choose : A. y=9000(0.15)t

or B. y=9000(0.85)t

Answer : The equation is

Part C.

Tiffany wants to buy the car from her mother now. (t = 5)

A fair price for the car will be about $

in 5 years.

George's friend Clarence, who is concerned about consumers, suggests implementing a price ceiling that is 50% lower than the monopoly price. With this price ceiling in place, the quantity demanded would increase to 65 units. However, the exact quantity supplied at this new price is not provided in your question.

George's friend Clarence is suggesting a price ceiling, which is a government-imposed limit on how high a price can be charged for a good or service. In this case, the price ceiling is set at 50% below the monopoly price. This means that the price charged for the good or service would be significantly lower than what the monopolistic supplier would typically charge.

At this lower price point, Clarence predicts that the quantity demanded would increase to 65 units, indicating that consumers would be more willing to purchase the product due to its lower price. However, it is unclear what the quantity supplied would be at this price point, as that information is missing from the question.

Overall, George's friend Clarence's suggestion of a price ceiling serves to protect consumers by limiting the monopolistic supplier's ability to charge exorbitant prices and instead promoting a more competitive market.

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For the given sequence a(26) = 2

To find a(26), we can use the recursive definition of the sequence and work our way up from a(0) and a(1):

a(0) = -1
a(1) = 1

a(2) = a(1) - a(0) = 1 - (-1) = 2
a(3) = a(2) - a(1) = 2 - 1 = 1
a(4) = a(3) - a(2) = 1 - 2 = -1
a(5) = a(4) - a(3) = -1 - 1 = -2
a(6) = a(5) - a(4) = -2 - (-1) = -1
a(7) = a(6) - a(5) = -1 - (-2) = 1
a(8) = a(7) - a(6) = 1 - (-1) = 2

From this pattern, we can see that the sequence repeats with a period of 6, so we can find a(26) by finding the remainder when 26 is divided by 6:

a(26) = a(26 mod 6) = a(2) = 2

Therefore, a(26) = 2.

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The answer is option [tex](cx^2y^2).[/tex]

To find the least common multiple (LCM) of [tex]xy, x^2,[/tex] and xy^2, we need to factor each term into its prime factors and then take the highest power of each factor.

xy = (x) * (y)

x^2 = (x) * (x)

xy^2 = (x) * [tex](y^2)[/tex]

The prime factorization of the given terms are:

xy = (x) * (y)

x^2 = (x) * (x)

xy^2 = (x) * [tex](y^2)[/tex]

So, the LCM can be found by taking the highest power of each factor, which gives us:

LCM = [tex](x^2)[/tex] * [tex](y^2)[/tex] =[tex]x^2y^2[/tex]

Therefore, the answer is option [tex](cx^2y^2).[/tex]

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This contradicts our assumption, so we conclude that 40 does not leave a remainder of 3 upon division by 7.

(a) To show that 45 leaves a remainder of 3 upon division by 7, we need to find an integer k such that 45 = 7k + 3. We can write 45 as 42 + 3, which gives us 45 = 7(6) + 3. Thus, n = 45 satisfies the definition and leaves a remainder of 3 upon division by 7.

(b) To show that -32 leaves a remainder of 3 upon division by 7, we need to find an integer k such that -32 = 7k + 3. We can write -32 as -35 + 3, which gives us -32 = 7(-5) + 3. Thus, n = -32 satisfies the definition and leaves a remainder of 3 upon division by 7.

(c) To show that 3 leaves a remainder of 3 upon division by 7, we need to find an integer k such that 3 = 7k + 3. We can write 3 as 0 + 3, which gives us 3 = 7(0) + 3. Thus, n = 3 satisfies the definition and leaves a remainder of 3 upon division by 7.

(d) To show that -4 leaves a remainder of 3 upon division by 7, we need to find an integer k such that -4 = 7k + 3. We can write -4 as -7 + 3, which gives us -4 = 7(-1) + 3. Thus, n = -4 satisfies the definition and leaves a remainder of 3 upon division by 7.

(e) To prove that 40 does not leave a remainder of 3 upon division by 7, we assume the opposite, that is, we assume that 40 does leave a remainder of 3 upon division by 7. This means that there exists an integer k such that 40 = 7k + 3. Rearranging this equation gives us 37 = 7k, which means that k is not an integer, since 37 is not divisible by 7. This contradicts our assumption, so we conclude that 40 does not leave a remainder of 3 upon division by 7.

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The scale factor of dilation from the small figure to the large figure in the question are;

3. 1 : 4

4. 5 : 6

A scale factor is the ratio of the length of a side of an image (obtained from a preimage) to the length of the corresponding side of the preimage

The scale factor of the polygons obtained from diagrams are;

3. 4.5 yd to 18 yd = 1 to 4

The scale factor is 1 to 4

4. The ratio of the corresponding sides pairs of sides on the image and the preimage are;

Ratio on the large triangle; 42 : 18 = 7 : 3

Ratio on the small triangle; 35 : 15 = 7 : 3

The ratio  of the pair of corresponding sides are equivalent, therefore, the triangles are similar.

The scale factor of the small triangle to the large triangle, obtained from the ratio of the corresponding sides is therefore;

35 : 42 = 5 : 6

15 : 18 = 5 : 6

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The area of her garden is 6,330 units² (option b).

We know that the area of the trapezoid plus the area of the right triangle is equal to the area of the rectangle:

Area of trapezoid + Area of right triangle = L x W

We can substitute in the formulas we found earlier for the areas of the trapezoid and the right triangle:

(1/2) x hT x L + (1/2) x W x (L - hT) = L x W

Simplifying and solving for hT, we get:

hT = (2W - L) / 2

Now we can plug this value into the formula for the area of the trapezoid:

Area of trapezoid = (1/2) x hT x L

= (1/2) x [(2W - L) / 2] x L

= (W - L/2) x L

To find the area of the garden, we need to subtract the area of the fish pond (which is the area of the right triangle) from the area of the rectangle. We already found the formula for the area of the right triangle:

Area of right triangle = (1/2) x W x (L - hT)

So the area of the garden is:

Area of garden = L x W - Area of right triangle

= L x W - (1/2) x W x (L - hT)

Substituting in the formula we found earlier for hT, we get:

Area of garden = L x W - (1/2) x W x (L - (2W - L)/2)

= L x W - (1/2) x W x (W/2)

Simplifying, we get:

Area of garden = (3/4) x L x W

Now we can substitute in the values given in the problem to find the area of the garden:

L = 60 units

W = 110 units

Area of garden = (3/4) x L x W

= (3/4) x 60 x 110

= 6,330 units²

Hence option (b) is the right one.

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The functions f(x) and g(x) given that [tex]x^2 f(x) = g(x) = x + 1[/tex], the function f and g are not the same, option D.

Rewriting the equation

We are given [tex]x^2  f(x) = g(x) = x + 1[/tex]. Let's rewrite this as two separate equations:

[tex]x^2 f(x) = x + 1[/tex]

g(x) = x + 1

Determining the relationship between f(x) and g(x)

We can rearrange the first equation to solve for f(x):

[tex]f(x) = (x + 1) / x^2[/tex]

Now, we have expressions for both f(x) and g(x):

[tex]f(x) = (x + 1) / x^2[/tex]

[tex]g(x) = x + 1[/tex]

Comparing the expressions for f(x) and g(x), we can see that they are not the same. The expressions for f(x) and g(x) differ, so the functions f(x) and g(x) are not the same.

Therefore, the correct answer is D) The functions f and g are not the same.

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Answer:

7. Dr. Agoncillo completed a total of 14 years of post-secondary education. (4 years undergrad + 4 years medical school + 5 years residency + 1 year fellowship = 14 years)

8. Dan consumed a total of 124 fluid ounces. (2 x 20 + 3 x 16 + 1 x 32 = 40 + 48 + 32 = 120 fluid ounces)

9. There are 175 ACE wraps in stock at this physical therapy clinic. (27 x 2 + 43 x 1 + 93 x 1 + 12 x 1 = 54 + 43 + 93 + 12 = 175 ACE wraps)

10. Karen consumed a total of 67 grams of sugar, 19 grams of fat, and 5 grams of protein in this snack. (Snickers: 20g sugar + 11g fat + 3g protein = 34g total; Doritos: 1g sugar + 8g fat + 2g protein = 11g total; Mt. Dew: 46g sugar + 0g fat + 0g protein = 46g total; 34g + 11g + 46g = 91g total sugar; 11g + 0g + 0g = 11g total fat; 3g + 2g + 0g = 5g total protein)

Step-by-step explanation:

Mark Brainliest!!

Answer: No, it is not.

Step-by-step explanation:

To figure out if a shape is a right triangle, we need to use the pythagorean theorem, which states that a^2 + b^2 = c^2.

In this case, a is equal to 5, b is equal to 9.2, and c is equal to 14.

a^2 is equal to 25 and b^2 is equal to 84.64, we can add these two values together to get 109.64.

Now, we calculate 14^2, which is 196.

We now have something to determine, is 109.64 equal to 196?

Since these two numbers are not equal to each other, the answer is no, and that means this triangle is not a right triangle.

Answer:

Triangle ABC is not a right triangle, as the sum of the squares of the shortest two sides do not equal to the square of the longest side.

Step-by-step explanation:

Pythagoras Theorem explains the relationship between the three sides of a right triangle. The square of the hypotenuse (longest side) is equal to the sum of the squares of the legs of a right triangle:

[tex]\boxed{a^2+b^2=c^2}[/tex]

where:

As we have been given the measures of all three sides of triangle ABC (where AB and AC are the shortest sides, and BC is the longest side), we can use Pythagoras Theorem to determine if the triangle is a right triangle.

If triangle ABC is a right triangle, then AB and AC will be the legs, and BC will be the hypotenuse.

Substitute the values into the formula:

[tex]\implies AB^2+AC^2=BC^2[/tex]

[tex]\implies 5^2+9.2^2=14^2[/tex]

[tex]\implies 25+84.64=196[/tex]

[tex]\implies 109.64=196[/tex]

As 109.64 does not equal 196, triangle ABC is not a right triangle.

The correlation of ranks is approximately 0.2.

Option A is the correct answer.

We have,

To compute the correlation of ranks, we first need to rank the scores in each subject:
Physics: 10, 17, 23, 28, 35, 43, 47
Rank: 1, 2, 3, 4, 5, 6, 7
Mathematics: 4, 8, 12, 23, 30, 31, 33, 45, 49
Rank: 1, 2, 3, 4, 5, 6, 7, 8, 9

Then, we can calculate the differences between the ranks for each student:
Physics ranks: 1-5, 2-3, 3-7, 4-6, 5-1, 6-4, 7-2
Differences: -4, -1, -4, -2, 4, 2, 5
Mathematics ranks: 1-8, 2-6, 3-7, 4-4, 5-1, 6-5, 7-2, 8-3, 9-9
Differences: -7, -4, -4, 0, 4, -1, 5, 5, 0

Next, we can calculate the sum of the products of the differences:
= Sum of products

= (-4)(-7) + (-1)(-4) + (-4)(-4) + (-2)(0) + (4)(4) + (2)(-1) + (5)(5)
= 28 + 4 + 16 + 0 + 16 - 2 + 25
= 87

Finally, we can use the formula for the correlation of ranks:
r = 1 - (6Σd²)/(n(n² - 1))
where d is the difference in ranks and n is the number of scores

Plugging in the values, we get:
r = 1 - (6(87))/(9(81-1))
= 1 - (522)/(648)
= 1 - 0.8056
= 0.1944

= 0.2

Therefore,

The correlation of ranks is approximately 0.2.

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a) 27 business owners plan to provide a holiday gift to their employees.

b) Using a z-table, the p-value for z = -0.1583 is 0.4371 (rounded to four decimal places).

c) The smallest level of significance for which we could draw this conclusion would be equal to the calculated p-value, which is 0.4371 (rounded to four decimal places).

(a) In the survey of 60 business owners, 45% plan to provide a holiday gift to their employees. To find the number of business owners planning to give gifts, multiply the total number of business owners (60) by the percentage (0.45): 60 x 0.45 = 27 business owners plan to provide a holiday gift to their employees.

(b) To compute the p-value for a hypothesis test to determine if the proportion of business owners providing holiday gifts has decreased from last year, first, find the test statistic:

z = (p_sample - p_population) / sqrt((p_population * (1 - p_population)) / n)
z = (0.45 - 0.46) / sqrt((0.46 * (1 - 0.46)) / 60)
z = -0.01 / 0.0632 = -0.1583

Using a z-table, the p-value for z = -0.1583 is 0.4371 (rounded to four decimal places).

(c) Since the p-value (0.4371) is greater than the level of significance α=0.05, we fail to reject the null hypothesis. Thus, we cannot conclude that the proportion of business owners providing gifts has decreased based on the given level of significance.

The smallest level of significance for which we could draw this conclusion would be equal to the calculated p-value, which is 0.4371 (rounded to four decimal places).

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The probability that a randomly selected Ping-Pong ball has a diameter of less than 2.7 cm is approximately 0.0668 or 6.68%.

To solve this problem, we need to standardize the value of 2.7 using the formula:

z = (x - μ) / σ

where:

x = 2.7 (the value we want to find the probability for)

μ = 3 (mean)

σ = 0.2 (standard deviation)

z = (2.7 - 3) / 0.2

z = -1.

Now, we need to find the probability that a randomly selected Ping-Pong ball has a diameter of less than 2.7 cm, which is the same as finding the area to the left of z = -1.5 on the standard normal distribution curve. We can use a standard normal distribution table or a calculator to find this area.

Using a standard normal distribution table, we can find the area to the left of z = -1.5 is 0.0668.

Therefore, the probability that a randomly selected Ping-Pong ball has a diameter of less than 2.7 cm is approximately 0.0668 or 6.68%.

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We can show that ∆ABC is congruent to ∆A′B′C′ by a translation of (x-2, y) unit(s) and a across the x-axis.

The coordinates of the triangle are A(8, 8), B(10, 4), C(2, 6), while the triangle A'B'C' is at A'(6, -8), B'(8, -4), C'(0, -6).

If a point O(x, y) is translated a units on the x axis and b units on the y axis, the new coordinate is O'(x+a, y+b).

If a point O(x, y) is reflected across the x axis, the new coordinate is O'(x, -y)

Hence if triangle ABC is translated -2 units on the x axis (2 units left), the new coordinates are A*(6, 8), B*(8, 4), C*(0, 6). If a reflection across the x axis is then done, the new coordinates are A'(6, -8), B'(8, -4), C'(0, -6).

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When two fair dice are rolled,

(a) P(F) = 1/9

(b) P(F|E) = 1/5

a. To compute P(F), we need to find the probability that the total of two dice is five. There are four ways to obtain a total of five: (1,4), (2,3), (3,2), and (4,1). Since each die has six possible outcomes, there are 6x6=36 possible outcomes when two dice are rolled. Therefore, P(F) = 4/36 = 1/9.

b. To compute P(F|E), we need to find the probability that the total of two dice is five given that the total is odd. Since the sum of two odd numbers is always even, we know that if an odd total shows on the dice, then the sum must be either 3, 5, 7, 9, or 11. Out of these possibilities, only one yields a total of 5, which is (2,3). Therefore, P(F|E) = 1/5.

We would expect the probability of F to change when we condition on E because the occurrence of E affects the sample space. When we know that an odd total shows on the dice, we can eliminate some of the possible outcomes and reduce the sample space. This makes it more likely that the remaining outcomes will satisfy the condition for F, which increases the probability of F. Therefore, P(F|E) is greater than P(F) because E provides additional information that makes F more likely.

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